Abstract：The rock mass structure of surrounding rocks with non linear large-scale deformation in deep entry of coal mines is studied. A new method is proposed to control floor heave considering the effect of the roof，side and corner on the floor in design. Based on the micro-fabric test，theoretic analysis，numerical simulation and in-situ test，mechanism of controlling floor heave with bolt-net-anchor coupling support technology is discussed. With the anchor wire at key location mobilizing the strength of deep rock，the compression force passing from top of the breaking rocks over the wall is lessened；with the intensity strengthened and deformation reduced，the length constrained by side for the floor heave is shortened；with the rigid bolt and corner grouting，the pressure from side decreased and the shear resistance at corner is improved. Therefore，floor heave is controlled effectively. The theory is applied to control the stability of deep coal roadway in Jiahe coal mine and in-situ measurement shows that the large-scale deformation and floor heave are successfully controlled.
